Intradiploic nontraumatic sphenoid arachnoid pit

Case contributed by Dr Balint Botz


Sustained a fall. Incidental finding.

Patient Data

Age: 50 years
Gender: Female
  • right fronto-parieto-temporal soft tissue hematoma but no IC bleeding or fracture. 
  • circumscribed, irregular, lytic lesion (18 x 10 x 7 mm) in the the left sphenoid bone with thin sclerotic margin and no sign of aggressive growth. The lesion was found to be unchanged when compared to prior study several years earlier. 

Key image highlighting the lesion. 

Case Discussion

Spontaneous lateral sphenoid arachnoid pits are not uncommon and can be found under a plethora of different names in the literature, such as aberrant arachnoid granulations, nontraumatic intradiploic arachnoid cysts,  or lateral sphenoid cephaloceles or meningoceles 1,2

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